PCB Design for Arduino Mega
Worked for 34 sec
Actualizado: la alimentación queda definida como USB hacia el Arduino Mega, y el shield toma 5V/3.3V desde los headers del Mega;
VIN queda intencionalmente sin usar.Archivos actualizados:
Siguiente paso recomendado: pasar al layout del shield y definir la forma/contorno compatible con Arduino Mega.
SPLIT ONE CONECTOR PER MOTOR
Thought for 4 sec
Entendido. Voy a separar el conector actual de motores en dos conectores independientes: uno para motor izquierdo y otro para motor derecho, manteniendo las mismas señales del pinout.
Worked for 2 mins
He separado la interfaz de motores en dos conectores:
- J1 = motor izquierdo: PWM, DIR, BRAKE, STOP, HALL_LEFT, GND.
- J2 = motor derecho: PWM, DIR, BRAKE, STOP, HALL_RIGHT, GND.
También coloqué J2 junto a J1 en el layout y actualicé la Project Specification. Queda listo para continuar con placement/routing.
Layout, DRC, update docs
Start PCB placement
Run ERC/DRC
Update connector pinout
Check manufacturability
Refine this doc
Ask about this doc
Project Specification — Arduino Mega Motor Sensor Shield
Project Overview
- Status: Draft schematic created.
- Device: Arduino Mega shield for a smart golf trolley / motor interface.
- Purpose: Interface an Arduino Mega 2560 with an MPU-9250 IMU, NEO-6M GPS, two ZS-X11H motor drivers, Hall feedback, and ACS712 current sensors.
Main Features
- Arduino Mega 2560 shield/header interface.
- MPU-9250 on I2C using Mega SDA/SCL: D20/D21.
- NEO-6M GPS on Serial2: Mega D17 RX2 from GPS TX, Mega D16 TX2 to GPS RX through a 10k/20k divider.
- Two ZS-X11H motor driver signal interfaces.
- Two ACS712 current sensor module inputs into A3/A4.
- Hall feedback on D18/D19 external interrupt pins.
Pin Mapping
Table
| Function | Arduino Mega Pin | Net |
|---|---|---|
| Left motor PWM | D46 | PWM_LEFT_MOTOR |
| Left motor DIR | D52 | DIR_LEFT_MOTOR |
| Left motor BRAKE | D50 | BRAKE_LEFT_MOTOR |
| Left motor STOP | D48 | STOP_LEFT_MOTOR |
| Right motor PWM | D44 | PWM_RIGHT_MOTOR |
| Right motor DIR | D30 | DIR_RIGHT_MOTOR |
| Right motor BRAKE | D28 | BRAKE_RIGHT_MOTOR |
| Right motor STOP | D26 | STOP_RIGHT_MOTOR |
| Hall left | D18 / INT5 | HALL_LEFT_MOTOR |
| Hall right | D19 / INT4 | HALL_RIGHT_MOTOR |
| MPU SDA | D20 / SDA | I2C_SDA |
| MPU SCL | D21 / SCL | I2C_SCL |
| MPU INT | D2 | MPU_INT |
| GPS TX to Mega RX2 | D17 | GPS_TX_TO_MEGA_RX2 |
| Mega TX2 to GPS RX | D16 | MEGA_TX2_RAW → divider → GPS_RX_3V3 |
| ACS712 right output | A3 | CURRENT_RIGHT |
| ACS712 left output | A4 | CURRENT_LEFT |
Power Tree
Table
| Rail | Source | Loads | Notes |
|---|---|---|---|
| USB 5V | Arduino Mega USB connector | Arduino Mega onboard power path | Primary input power comes from USB connected to the Mega. |
| 5V | Arduino Mega 5V header, derived from USB | ACS712 modules | Shield must not inject external power into VIN; it receives 5V from the Mega header. |
| 3V3 | Arduino Mega 3.3V header | MPU-9250, NEO-6M module, I2C pull-ups | Keep within Mega 3.3V current capability; verify GPS module current. |
| GND | Arduino Mega GND header | all modules/connectors | Common ground to ZS-X11H control connector required. |
Important Design Decisions
- Power enters through the Arduino Mega USB port; VIN is intentionally unused on this shield.
- The motor-driver interface is split into one connector per motor: J1 for left ZS-X11H and J2 for right ZS-X11H.
- GPS uses Serial2 (D16/D17) to avoid conflict with Hall sensors on D18/D19.
- MPU-9250 uses I2C on D20/D21; optoencoders should not use these pins if I2C is populated.
- Mega TX2 is level shifted to GPS RX with a 10k/20k divider to avoid driving a 3.3V GPS input with 5V logic.
- ZS-X11H motor outputs are signal-level only; motor power wiring should remain off-board/high-current and not through this shield unless explicitly redesigned.
Open Assumptions
- ACS712 is used as a 3-pin module powered from 5V, not a bare ACS712 IC with high-current copper path on the shield.
- NEO-6M is represented by the module component and powered from 3.3V; confirm the exact breakout accepts 3.3V directly.
- Arduino Mega VIN is intentionally unused by the shield; the shield takes 5V/3.3V from the Mega headers.
Project Overview
Main Features
Pin Mapping
Power Tree
Important Design Decisions
Open Assumptions
